Patents by Inventor Gloria L. Dingwall

Gloria L. Dingwall has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Heating system using outside air
    Patent number: 4038963
    Abstract: A heating system having a furnace which intakes air for combustion purposes, and produces exhaust gases which are emitted through a flue pipe. One coupling device interconnects a draft opening in the flue pipe with the exterior of the building for allowing air outside of the building to provide the draft for the flue pipe. A second coupling device interconnects the air intake with the outside of the building for allowing use of air outside of the building as the air supply for the furnace.
    Type: Grant
    Filed: February 9, 1976
    Date of Patent: August 2, 1977
    Inventor: Gloria L. Dingwall